Meanwhile, shares in Chipotle(CMG) swung between gains and losses in extended trading after the company reported that quarterly profits were down 82% from last summer due to high-profile E. coli problems.

Shares in Vodafone(VOD) are rising by about 5% in London after the European mobile operator reported better-than-expected quarterly results.

Southwest Airlines(LUV) shares were holding steady ahead of the open after the airline canceled 1,150 flights in 24 hours. The trouble was initially caused by a "system outage." Shares in Southwest dropped by 11% on Thursday.

"Output and new orders both fell for the first time since the end of 2012, while service providers' optimism about the coming 12 months slumped to a seven-and-a-half year low," the group said in a statement.

This raises hopes that the Bank of England will cut interest rates in August. The pound dropped sharply in the wake of the report.